class_docstr: Class for the Hitting Set Algorithm to obtain a approximate minimal set of backdoor variables
  to condition on for each node pair.
docstr: :param list_of_sets: List of sets such that each set comprises nodes representing a single backdoor path between a source node and a target node.
docstr_tok: [":","param","list_of_sets",":","List","of","sets","such","that","each","set","comprises","nodes","representing","a","single","backdoor","path","between","a","source","node","and","a","target","node","."]
code: def __init__(self, list_of_sets, colliders=set()):
      """
      :param list_of_sets: List of sets such that each set comprises nodes representing a single backdoor path between a source node and a target node.
      """
      self._list_of_sets = list_of_sets
      self._colliders = colliders
      self._var_count = self._count_vars()
  
imports: import networkx
  from dowhy.utils.graph_operations import adjacency_matrix_to_adjacency_list
label_desc: Use image node_id 1 to create a new HittingSetAlgorithm object  with example: obj = HittingSetAlgorithm(list_of_sets, colliders)